세심(sesim) vs ONE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
세심(sesim)
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The simplest way to manage your habits. Sesim removes unnecessary complexity and keeps only the features you need. Key Features - Check today’s habits - Create habits by type: daily goals or weekly goals - Reminder push notifications - Daily, weekly, monthly, and yearly records - Light and dark themes - Custom accent color settings Simple, focused, and easy to use. Start building your habits with Sesim.
ONE
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Not another to-do list. ONE Focus is a single-task focus timer for a deeper life. You commit to one thing at a time—nothing else on screen, nothing competing for your attention. WHY ONE FOCUS? • One thing only — no lists, no tabs, no clutter • Start in one line — type a title, press return, begin • Gentle accountability — a progress check-in every 45 minutes • Five-step progress — 0, 25, 50, 75, or 100%, with an optional note • Quiet by design — no streak anxiety, no gamification, no noise • Night quiet hours — no notifications between 22:00 and 09:00 • Minimal history — see what you've finished, nothing more HOW IT WORKS 1. Enter one thing and start 2. Stay with it — elapsed time keeps you honest 3. Respond to check-ins when prompted (or update progress anytime) 4. Mark complete when you're done 5. Move on to the next moment DESIGNED TO FEEL CALM Editorial Noir typography, generous whitespace, and champagne-gold accents. Dark-first. No feature bloat. No account required. Everything stays on your device. Built for focus, study, deep work, and everyday presence—reading to your child, cooking a meal, taking a walk, creating something meaningful, or simply being here. Download. Pick one thing. Live it fully.
Screenshots
Verdict
The clearest difference is update cadence: ONE at every 2 weeks against 세심(sesim)'s every 4 months. 세심(sesim)'s advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
세심(sesim) ships an update every 4 months, ONE every 2 weeks. The most recent releases landed on October 18, 2026 and October 28, 2026 respectively.
| Parameter | 세심(sesim) | ONE |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 27 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Mirae Jin | 骋飞 武 |
In-app purchases
세심(sesim)
No in-app purchases
ONE
No in-app purchases









